The effect of fracture and fracture fixation on ultrasonic velocity and attenuation.


:Measurement of the velocity of propagation and attenuation of ultrasound (200 kHz) is believed to be a useful non-invasive technique for assessing the mechanical properties of bone. A new method for the determination of ultrasound velocity and attenuation of longitudinal waves in cortical bone was used in vivo and in situ on intact and fractured human tibiae. The measured ultrasound attenuation and velocity were found to be unaffected by the soft tissue between transducers and bone. The ultrasound velocity in vivo on control tibiae was 3614 +/- 32 m s-1 and the attenuation was 5.52 +/- 0.43 dB MHz-1 cm-1. The ultrasound velocity in fractured tibiae was considerably lower 1 week after fracture (2375 +/- 82 m s-1), but had significantly increased after 3 weeks (to 2882 +/- 90 m s-1). A higher attenuation was measured 1 week after fracture (17.81 +/- 3.91 dB MHz-1 cm-1), but it had decreased again 3 weeks after fracture (10.42 +/- 3.56 dB MHz-1 cm-1). In situ studies under well-defined conditions confirmed the in vivo results. The effects of internal plate fixation and gradually cutting through the cortex on the ultrasound velocity and attenuation were studied in situ. These results demonstrate the clinical potential of this technique for the non-invasive assessment of bone fracture healing.


Physiol Meas


Saulgozis J,Pontaga I,Lowet G,Van der Perre G




Has Abstract


1996-08-01 00:00:00












  • Real-time chest-wall-motion tracking by a single optical fibre grating: a prospective method for ventilator triggering.

    abstract:OBJECTIVE:The ventilators involved in non-invasive mechanical ventilation commonly provide ventilator support via a facemask. The interface of the mask with a patient promotes air leaks that cause errors in the feedback information provided by a pneumatic sensor and hence patient-ventilator asynchrony with multiple neg...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Ivanović MD,Petrovic J,Savić A,Gligorić G,Miletić M,Vukčević M,Bojović B,Hadžievski L,Allsop T,Webb DJ

    更新日期:2018-04-26 00:00:00

  • Relationship between detrended fluctuation analysis and spectral analysis of heart-rate variability.

    abstract::The recently-introduced technique of detrended fluctuation analysis (DFA) for heart-rate variability appears to yield improved prognostic power in cardiovascular disease through calculation of the fractal scaling exponent alpha. However, the physiological meaning of alpha remains unclear. In DFA, the signal is segment...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Willson K,Francis DP,Wensel R,Coats AJ,Parker KH

    更新日期:2002-05-01 00:00:00

  • Estimating carotid pulse and breathing rate from near-infrared video of the neck.

    abstract:OBJECTIVE:Non-contact physiological measurement is a growing research area that allows capturing vital signs such as heart rate (HR) and breathing rate (BR) comfortably and unobtrusively with remote devices. However, most of the approaches work only in bright environments in which subtle photoplethysmographic and balli...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Chen W,Hernandez J,Picard RW

    更新日期:2018-10-30 00:00:00

  • Fetal beat detection in abdominal ECG recordings: global and time adaptive approaches.

    abstract::We present a method for location of fetal QRS in maternal abdominal ECG recordings. This method's initial, global approach was proposed in the context of the 2013 PhysioNet/Computing in Cardiology Challenge where it was tested on the 447 four channel one-minute recordings.The first step is filtering to eliminate basel...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Rodrigues R

    更新日期:2014-08-01 00:00:00

  • Personalized automatic sleep staging with single-night data: a pilot study with Kullback-Leibler divergence regularization.

    abstract:OBJECTIVE:Brain waves vary between people. This work aims to improve automatic sleep staging for longitudinal sleep monitoring via personalization of algorithms based on individual characteristics extracted from sleep data recorded during the first night. APPROACH:As data from a single night are very small, thereby ma...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Phan H,Mikkelsen K,Chén OY,Koch P,Mertins A,Kidmose P,De Vos M

    更新日期:2020-07-01 00:00:00

  • Correlation between maximal radial muscle displacement and stiffness in gastrocnemius muscle.

    abstract:OBJECTIVE:Tensiomyography (TMG) and myotonometry (MMT) are two novel technologies that measure neuromuscular properties. These two devices measure the stiffness of the soft tissue as well as other variables. The aim of this study is to analyze if there is any correlation between maximal radial displacement (Dm) and Sti...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Labata-Lezaun N,López-de-Celis C,Llurda-Almuzara L,González-Rueda V,Cadellans-Arróniz A,Pérez-Bellmunt A

    更新日期:2020-12-31 00:00:00

  • Adipose tissue thickness does not affect the electromechanical delay.

    abstract::During voluntary contractions in humans, the subcutaneous tissues between surface electrodes and active motor units have been shown to attenuate surface electromyographic (EMG) signal amplitude. The purpose of this investigation was to examine the relationship between adipose tissue thickness and the electromechnical ...

    journal_title:Physiological measurement

    pub_type: 临床试验,杂志文章


    authors: Stock MS,Thompson BJ

    更新日期:2016-03-01 00:00:00

  • In vivo quantification of accumulating abdominal fluid using an electrical impedance tomography hemiarray.

    abstract::A new method to image and quantify intra-abdominal haemorrhage using electrical impedance tomography (EIT) was tested in vivo. Supine peritoneal dialysis patients were monitored using an 8-electrode hemiarray placed on the anterior abdomen. EIT measurements were recorded using the EPack II data acquisition system befo...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Tucker AS,Ross EA,Paugh-Miller J,Sadleir RJ

    更新日期:2011-02-01 00:00:00

  • Esophageal temperature monitoring during radiofrequency catheter ablation: experimental study based on an agar phantom model.

    abstract::Although previous studies have established the feasibility of monitoring esophageal temperature during radiofrequency cardiac ablation using an esophageal temperature probe (ETP), some questions remain regarding its efficacy. The aims of this study were to study the effect of the location of the ETP on the temperature...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Rodríguez I,Lequerica JL,Berjano EJ,Herrero M,Hornero F

    更新日期:2007-05-01 00:00:00

  • Non-contact video-based vital sign monitoring using ambient light and auto-regressive models.

    abstract::Remote sensing of the reflectance photoplethysmogram using a video camera typically positioned 1 m away from the patient's face is a promising method for monitoring the vital signs of patients without attaching any electrodes or sensors to them. Most of the papers in the literature on non-contact vital sign monitoring...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Tarassenko L,Villarroel M,Guazzi A,Jorge J,Clifton DA,Pugh C

    更新日期:2014-05-01 00:00:00

  • Use of the discriminant Fourier-derived cepstrum with feature-level post-processing for surface electromyographic signal classification.

    abstract::Myoelectrical pattern classification is a crucial part in multi-functional prosthesis control. This paper investigates a discriminant Fourier-derived cepstrum (DFC) and feature-level post-processing (FLPP) to discriminate hand and wrist motions using the surface electromyographic signal. The Fourier-derived cepstrum t...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Chen X,Zhu X,Zhang D

    更新日期:2009-12-01 00:00:00

  • Multiple breath washout analysis in infants: quality assessment and recommendations for improvement.

    abstract::Infant multiple breath washout (MBW) testing serves as a primary outcome in clinical studies. However, it is still unknown whether current software algorithms allow between-centre comparisons. In this study of healthy infants, we quantified MBW measurement errors and tried to improve data quality by simply changing so...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Anagnostopoulou P,Egger B,Lurà M,Usemann J,Schmidt A,Gorlanova O,Korten I,Roos M,Frey U,Latzin P

    更新日期:2016-03-01 00:00:00

  • Wavelet-based real-time calculation of multiple physiological parameters on an embedded platform.

    abstract:OBJECTIVE:This paper aims to present how physiological signals can be processed based on wavelet decomposition to calculate multiple physiological parameters in real-time on an embedded platform. APPROACH:An ECG and PPG are decomposed to the appropriate scale based on a quadratic spline wavelet base in order to obtain...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Tang M,Xia P,He Z,Zhao Z,Chen X,Yang T,Zhang Z,Zhan Q,Li X,Fang Z

    更新日期:2020-03-06 00:00:00

  • Restoration of the electrocardiogram during mechanical cardiopulmonary resuscitation.

    abstract:OBJECTIVE:An artefact-free electrocardiogram (ECG) is essential during cardiac arrest to decide therapy such as defibrillation. Mechanical cardiopulmonary resuscitation (CPR) devices cause movement artefacts that alter the ECG. This study analyzes the effectiveness of mechanical CPR artefact suppression filters to rest...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Isasi I,Irusta U,Aramendi E,Idris AH,Sörnmo L

    更新日期:2020-11-06 00:00:00

  • Endocardial center motion for quantification of left ventricular discoordination in heart failure using cine MRI.

    abstract:OBJECTIVE:To compare a novel cardiovascular magnetic resonance technique for the assessment of left ventricular (LV) mechanical discoordination by characterizing the endocardial center motion (ECM) in short-axis cine MRI in healthy volunteers and heart failure patients with left bundle branch block (HF-LBBB). APPROACH...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Saporito S,Houthuizen P,Aben JMM,Westenberg JJM,van Den Bosch HCM,van Assen HC,Mischi M

    更新日期:2018-02-28 00:00:00

  • Single-sector thermophysiological human simulator.

    abstract::Thermal sweating manikins are used to analyse the heat and mass transfer phenomena in the skin-clothing-environment system. However, the limiting factor of present thermal manikins is their inability to simulate adequately the human thermal behaviour, which has a significant effect on the clothing microenvironment. A ...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Psikuta A,Richards M,Fiala D

    更新日期:2008-02-01 00:00:00

  • Comprehensive analysis of cardiac health using heart rate signals.

    abstract::The electrocardiogram is a representative signal containing information about the condition of the heart. The shape and size of the P-QRS-T wave, the time intervals between its various peaks, etc may contain useful information about the nature of disease affecting the heart. However, the human observer cannot directly...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Acharya U R,Kannathal N,Krishnan SM

    更新日期:2004-10-01 00:00:00

  • Video-based respiration monitoring with automatic region of interest detection.

    abstract::Vital signs monitoring is ubiquitous in clinical environments and emerging in home-based healthcare applications. Still, since current monitoring methods require uncomfortable sensors, respiration rate remains the least measured vital sign. In this paper, we propose a video-based respiration monitoring method that aut...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Janssen R,Wang W,Moço A,de Haan G

    更新日期:2016-01-01 00:00:00

  • Eye-tracker algorithms to detect saccades during static and dynamic tasks: a structured review.

    abstract:OBJECTIVE:Eye-tracking devices have become widely used as clinical assessment tools in a variety of applied-scientific fields to measure saccadic eye movements. With the emergence of multiple static and dynamic devices, the concurrent need for algorithm development and validation is paramount. APPROACH:This review ass...

    journal_title:Physiological measurement

    pub_type: 杂志文章,评审


    authors: Stuart S,Hickey A,Vitorio R,Welman K,Foo S,Keen D,Godfrey A

    更新日期:2019-02-26 00:00:00

  • Trabecular thickness measurement in cancellous bones: postmortem rat studies with the zoom-in micro-tomography technique.

    abstract::Using the cross-sectional images taken with the zoom-in micro-tomography technique, we measured trabecular thicknesses of femur bones in postmortem rats. Since the zoom-in micro-tomography technique is capable of high resolution imaging of a small local region inside a large subject, we were able to measure the trabec...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Cho MH,Chun IK,Lee SC,Cho MH,Lee SY

    更新日期:2005-10-01 00:00:00

  • A method for comparative evaluation of EIT algorithms using a standard data set.

    abstract::The point spread function (PSF) is the most widely used tool for quantifying the spatial resolution of imaging systems. However, prerequisites for the proper use of this tool are linearity and space invariance. Because EIT is non-linear it is only possible to compare different reconstruction algorithms using a standar...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Ider YZ,Eyüboğlu BM,Kuzuoğlu M,Leblebïcïoğlu K,Baysal U,Cağlar BK,Bïrgül O

    更新日期:1995-08-01 00:00:00

  • Dynamic data monitoring improves predictive analytics for failed extubation in the ICU.

    abstract:OBJECTIVE:Predictive analytics monitoring that informs clinicians of the risk for failed extubation would help minimize both the duration of mechanical ventilation and the risk of emergency re-intubation in ICU patients. We hypothesized that dynamic monitoring of cardiorespiratory data, vital signs, and lab test result...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Keim-Malpass J,Enfield KB,Calland JF,Lake DE,Clark MT

    更新日期:2018-07-16 00:00:00

  • Modelling of the immunoassay element of an optical immunosensor.

    abstract::Several factors affect the viability of biosensor design. A computer-based model is being developed to enable the sources and effect of noise and variability within the sensor to be analysed. The work now presented details the modelling of the biochemical aspect of the biosensor model-the immunoassay. The equilibrium ...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Keating SM,Flanagan MT

    更新日期:2001-08-01 00:00:00

  • Changes in cerebral hemodynamics during a sleep-deprived video-electroencephalogram in healthy children.

    abstract::This study investigates the cerebral hemodynamic changes during a routine sleep-deprived video-electroencephalogram (SD-VEEG) in healthy children. Forty-two children with normal intelligence were examined. The children were 5-14 years of age, and their electroencephalograms (EEGs) were within the normal range. Each su...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Peng B,Li J,Wang J,Liang X,Zheng Z,Mai J

    更新日期:2016-07-01 00:00:00

  • A novel LabVIEW-based multi-channel non-invasive abdominal maternal-fetal electrocardiogram signal generator.

    abstract::This paper describes the design, construction, and testing of a multi-channel fetal electrocardiogram (fECG) signal generator based on LabVIEW. Special attention is paid to the fetal heart development in relation to the fetus' anatomy, physiology, and pathology. The non-invasive signal generator enables many parameter...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Martinek R,Kelnar M,Koudelka P,Vanus J,Bilik P,Janku P,Nazeran H,Zidek J

    更新日期:2016-02-01 00:00:00

  • Sleep stage classification with ECG and respiratory effort.

    abstract::Automatic sleep stage classification with cardiorespiratory signals has attracted increasing attention. In contrast to the traditional manual scoring based on polysomnography, these signals can be measured using advanced unobtrusive techniques that are currently available, promising the application for personal and co...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Fonseca P,Long X,Radha M,Haakma R,Aarts RM,Rolink J

    更新日期:2015-10-01 00:00:00

  • Automatic detection of detached and erroneous electrodes in electrical impedance tomography.

    abstract::One unfortunate occurrence in experimental measurements with electrical impedance tomography is electrodes which become detached or poorly connected, such that the measured data cannot be used. This paper presents an automatic approach to detect such erroneous electrodes. It is based on the assumption that all valid m...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Asfaw Y,Adler A

    更新日期:2005-04-01 00:00:00

  • Cooperative dry-electrode sensors for multi-lead biopotential and bioimpedance monitoring.

    abstract::Cooperative sensors is a novel measurement architecture that allows the acquiring of biopotential signals on patients in a comfortable and easy-to-integrate manner. The novel sensors are defined as cooperative in the sense that at least two of them work in concert to measure a target physiological signal, such as a mu...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Rapin M,Proença M,Braun F,Meier C,Solà J,Ferrario D,Grossenbacher O,Porchet JA,Chételat O

    更新日期:2015-04-01 00:00:00

  • Cardiac-related changes in lung resistivity as a function of frequency and location obtained from EITS images.

    abstract::ECG-gated electrical impedance tomographic spectroscopy (EITS) measurements of the lungs were taken on seven normal subjects in the frequency range 9.6 kHz to 614.4 kHz. The results show that in late systole the resistivity p' relative to the R-wave (i.e. p' = 1 at the R-wave) decreases consistently within the lung. I...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Nopp P,Zhao TX,Brown BH,Wang W

    更新日期:1996-11-01 00:00:00

  • Measuring gait with an accelerometer-based wearable: influence of device location, testing protocol and age.

    abstract::Wearables such as accelerometers are emerging as powerful tools for quantifying gait in various environments. Flexibility in wearable location may improve ease of use and data acquisition during instrumented testing. However, change of location may impact algorithm functionality when evaluating associated gait charact...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Del Din S,Hickey A,Hurwitz N,Mathers JC,Rochester L,Godfrey A

    更新日期:2016-10-01 00:00:00